What is CVE-2021-27393?

CVE-2021-27393 is a medium-severity vulnerability in Siemens Nucleus Net, classified under Use of Insufficiently Random Values. CVSS score: 5.3/10. Published 2021-04-22.

How severe is CVE-2021-27393?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Siemens Nucleus Net

CVE-2021-27393

A vulnerability has been identified in Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2013.08), Nucleus Source Code (Versions including affected DNS modules). The DNS client does not properly randomize UDP port numbers…

EPSS: 0.008 (50.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

Siemens Nucleus Net — versions All versions
Siemens Nucleus_net
Siemens Nucleus Readystart V3 — versions All versions < V2013.08
Siemens Nucleus_readystart_v3
Siemens Nucleus Source Code — versions Versions including affected DNS modules
Siemens Nucleus_source_code

Weakness classification (CWE)

CWE-330 — Use of Insufficiently Random Values

References

productcert@siemens.com (x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2021-27393?: CVE-2021-27393 is a medium-severity vulnerability in Siemens Nucleus Net, classified under Use of Insufficiently Random Values. CVSS score: 5.3/10. Published 2021-04-22.
How severe is CVE-2021-27393?: Medium severity. CVSS v3 base score is 5.3 out of 10.